ok what cam will weild the most horsepower while still passing emissions in golden california?

i intend to get the lt4 kit, but i dont really want the hot cam because many people dont think to much of a hot cam (donno why but taking peoples word for it)

so what cam would work best with the lt4 heads?

 

The CC305 on a 114 LSA should pass emissions with no sweat, yet still make very good power.

 

CC305! I know GMHTP passed NJ emission with Thunderchicken with this cam. I'm not sure how California compares to NJ, though.

I'm running 12.0's with one.

Frank

 

sorry to ask about newbyish things but what does he mean by 114 LSA?

 

Lobe Seperation Angle. The higher the # the wider the lobes are spread. The wider the lobe sep. the smoother the idle, and the more manifold vacuum. Wider lobe sep. tends to make more top end HP.

Frank

 

so sounds like the wider the lobe the better... its more horsepower and smoother idle? u think there wouldnt be much in consideration if the wider the better... usually there is some compromising.

 

Frank was right on. However, the compromise is that NA engines require overlap to effectively fill the cylinders (overlap=intake and exhaust valves open at the same time). Midrange torque jumps up by tightening the LSA, and throttle response also improves. For the record, OEM cam LSA is 116.5, so bigger is not always better. A 114 LSA is a good compromise between emissions and overlap.

 

and supercharged engines are different?

so i should get something around 114? how quickly does it change? 114 will be a little rougher idle then my stock car?
but it will have more midrange power?

 

You don't want a ton of overlap on FI cars....you're just blowing the charge right out of the exhaust.

 

that makes a lot of sense, so forced induction u would want an lsa of what?

and is higher or lower angle better for emissions?

 

Generally speaking F.I. people go with cams with a 114 and some higher LSA, but many still run 112-113. The lower the LSA on the cam, the more it will raise your powerband. I am going with a 112 LSA for a mainly N/A car, with nitrous down the road. Typically the numerically higher the LSA the easier it is on emissions, but you may be sacrificing a little power/ lope, but it all depends what you are looking for. I know two people here with the 305, one with a 114 LSA, and one on a 112. They are set up identically, and the 112 LSA car is trapping 4 mph higher, and it does sound meaner. However since emissions is one of your main concerns you should check what people in Cali have passed with. I know people here that failed with both the hotcam and 305, but then passed with an emissions tune. I am currently installing a 306, and if I cant tune it to pass, I just plan on a double cam swap weekend for emissions .

Brandon